152 lines
4.6 KiB
C
152 lines
4.6 KiB
C
/*------------------------------------------------------------------------*/
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/* Sample code of OS dependent controls for FatFs */
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/* (C)ChaN, 2014 */
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/*------------------------------------------------------------------------*/
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#include <fatfs/ff.h>
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#if _FS_REENTRANT
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/*------------------------------------------------------------------------*/
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/* Create a Synchronization Object */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount() function to create a new
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/ synchronization object, such as semaphore and mutex. When a 0 is returned,
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/ the f_mount() function fails with FR_INT_ERR.
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*/
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int ff_cre_syncobj ( /* 1:Function succeeded, 0:Could not create the sync object */
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BYTE vol, /* Corresponding volume (logical drive number) */
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_SYNC_t *sobj /* Pointer to return the created sync object */
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)
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{
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int ret;
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*sobj = CreateMutex(NULL, FALSE, NULL); /* Win32 */
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ret = (int)(*sobj != INVALID_HANDLE_VALUE);
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// *sobj = SyncObjects[vol]; /* uITRON (give a static sync object) */
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// ret = 1; /* The initial value of the semaphore must be 1. */
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// *sobj = OSMutexCreate(0, &err); /* uC/OS-II */
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// ret = (int)(err == OS_NO_ERR);
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// *sobj = xSemaphoreCreateMutex(); /* FreeRTOS */
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// ret = (int)(*sobj != NULL);
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Delete a Synchronization Object */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount() function to delete a synchronization
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/ object that created with ff_cre_syncobj() function. When a 0 is returned,
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/ the f_mount() function fails with FR_INT_ERR.
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*/
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int ff_del_syncobj ( /* 1:Function succeeded, 0:Could not delete due to any error */
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_SYNC_t sobj /* Sync object tied to the logical drive to be deleted */
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)
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{
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int ret;
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ret = CloseHandle(sobj); /* Win32 */
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// ret = 1; /* uITRON (nothing to do) */
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// OSMutexDel(sobj, OS_DEL_ALWAYS, &err); /* uC/OS-II */
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// ret = (int)(err == OS_NO_ERR);
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// vSemaphoreDelete(sobj); /* FreeRTOS */
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// ret = 1;
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Request Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on entering file functions to lock the volume.
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/ When a 0 is returned, the file function fails with FR_TIMEOUT.
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*/
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int ff_req_grant ( /* 1:Got a grant to access the volume, 0:Could not get a grant */
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_SYNC_t sobj /* Sync object to wait */
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)
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{
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int ret;
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ret = (int)(WaitForSingleObject(sobj, _FS_TIMEOUT) == WAIT_OBJECT_0); /* Win32 */
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// ret = (int)(wai_sem(sobj) == E_OK); /* uITRON */
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// OSMutexPend(sobj, _FS_TIMEOUT, &err)); /* uC/OS-II */
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// ret = (int)(err == OS_NO_ERR);
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// ret = (int)(xSemaphoreTake(sobj, _FS_TIMEOUT) == pdTRUE); /* FreeRTOS */
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return ret;
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}
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/*------------------------------------------------------------------------*/
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/* Release Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on leaving file functions to unlock the volume.
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*/
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void ff_rel_grant (
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_SYNC_t sobj /* Sync object to be signaled */
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)
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{
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ReleaseMutex(sobj); /* Win32 */
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// sig_sem(sobj); /* uITRON */
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// OSMutexPost(sobj); /* uC/OS-II */
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// xSemaphoreGive(sobj); /* FreeRTOS */
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}
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#endif
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#if _USE_LFN == 3 /* LFN with a working buffer on the heap */
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/*------------------------------------------------------------------------*/
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/* Allocate a memory block */
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/*------------------------------------------------------------------------*/
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/* If a NULL is returned, the file function fails with FR_NOT_ENOUGH_CORE.
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*/
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void* ff_memalloc ( /* Returns pointer to the allocated memory block */
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UINT msize /* Number of bytes to allocate */
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)
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{
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return malloc(msize); /* Allocate a new memory block with POSIX API */
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}
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/*------------------------------------------------------------------------*/
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/* Free a memory block */
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/*------------------------------------------------------------------------*/
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void ff_memfree (
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void* mblock /* Pointer to the memory block to free */
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)
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{
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free(mblock); /* Discard the memory block with POSIX API */
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}
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#endif
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